<span>It's because there are 4 numbers in 4325, and only 3 in 798.
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Answer:
missing side: 2x+3y
Step-by-step explanation:
Since the given 2 sides are x-y and x+y and P=4x+3y,
x-y+x+y= 2x
4x+3y-2x= 2x+3y
Check:
x-y+x+y+2x+3y= 4x+3y
Answer:
10,000
Step-by-step explanation:
This is because, if you do 10 times 1,000, you would get 10,000
Answer:
Credit remaining after 21 minutes = $30.4
Step-by-step explanation:
Credit remaining on a phone card is a linear function of the total calling time.
When graphed, let the linear function representing the line is,
y = mx + b
Where 'm' = slope of the line
b = y-intercept
From the graph,
Slope of the line = -0.12
y = -0.12x + b
If this line passes through a point (33, 28.96),
28.96 = -0.12(33) + b
b = 28.96 + 3.96
b = 32.92
Therefore, the linear function is,
f(x) = -0.12x + 32.92
where x = calling time
Credit left in the card after 21 minutes,
f(21) = -0.12(21) + 32.92
= -2.52 + 32.92
= $30.4
